Hematologist
CION Cancer Clinics
What a positive sickle cell solubility test means | CION Cancer Clinics
A positive sickle cell solubility test means sickle haemoglobin was found in the blood. It does not tell you whether the person has sickle cell trait, which rarely causes illness, or sickle cell disease. That needs a confirmatory test, usually HPLC or haemoglobin electrophoresis, which measures each haemoglobin type separately. A negative screen can also mislead in a young baby, after a recent transfusion or when haemoglobin is very low. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
BP
Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
17+specialists on panel
15,000+patients treated
35+centres across Telangana & AP
4.8★ / 800+Google rating
On this page
- What does a positive sickle cell solubility test mean?
- How is the screening test different from the confirmatory test?
- What should you do after a positive screen?
- What do the words on a confirmatory report mean?
- When can a sickle cell test give the wrong answer?
- What do families often get wrong about a positive screen?
- What can a confirmatory report not tell you?
- Common questions about the solubility test and confirmation
The short answer
What does a positive sickle cell solubility test mean?
A positive solubility test means sickle haemoglobin was found in the blood sample. It does not tell you whether the person has sickle cell trait or sickle cell disease, so it must be followed by a confirmatory test before anyone is told what they have.
How the solubility test works
A few drops of blood are mixed with a chemical that takes oxygen away from the haemoglobin. Normal haemoglobin stays dissolved and the liquid stays clear. Sickle haemoglobin clumps together without oxygen, so the liquid turns cloudy. The technician reads that cloudiness by eye. It is quick, cheap and needs very little equipment, which is why it is used for screening in villages, schools and government health centres.
Why a cloudy tube is only half an answer
The tube turns cloudy whether a person carries one sickle gene or two. Someone with the trait usually lives a normal life. Someone with the disease needs regular care from a haematologist, a doctor who treats blood disorders. The solubility test cannot separate these two people. It also cannot pick up other haemoglobin changes that matter, such as beta thalassaemia, which can combine with a sickle gene and cause disease.
Treat a solubility result as a signal to test further, never as a diagnosis on its own.Side by side
How is the screening test different from the confirmatory test?
Solubility test (screening)
HPLC or electrophoresis (confirmation)
Asks one question: is sickle haemoglobin present?
Measures each type of haemoglobin separately
Cannot tell trait from disease
Shows whether the pattern fits trait, disease or a mixed pattern
Misses beta thalassaemia and other variants
Picks up most common variants seen in India
Done on the spot with simple equipment
Done in a laboratory with a dedicated machine
Result read by eye as cloudy or clear
Result printed as a report that a doctor interprets
Not sure whether this applies to you?
Ask an oncologistWhat happens next
What should you do after a positive screen?
Keep the screening slip
Do not throw away the paper or the card you were given. Note where and when the test was done. If the person had a blood transfusion in the months before, write that down too, because it changes how the next result is read.
Get a confirmatory test
Ask for HPLC (high performance liquid chromatography) or haemoglobin electrophoresis. Both separate the haemoglobin types. Government programmes often send positive samples for this test free of charge. A full blood count is usually done on the same sample.
Test the parents or partner
For a child, testing both parents helps the doctor read a borderline or mixed pattern. For an adult planning marriage or pregnancy, testing the partner shows the chance of a child being affected.
Have the report explained
Take the confirmatory report to a haematologist. They will read it with the blood count, symptoms and family history, and tell you whether any further test, such as a DNA test, is needed.
On your report
What do the words on a confirmatory report mean?
- HbA
- Normal adult haemoglobin. Most of the haemoglobin in a person without a sickle gene is this type.
- HbS
- Sickle haemoglobin. Its amount compared with HbA is what separates trait from disease.
- HbF
- Foetal haemoglobin, the type a baby is born with. It is naturally high in young babies and can be raised in some adults with sickle cell.
- HbA2
- A minor haemoglobin. A raised level can point to beta thalassaemia trait, which matters when it sits alongside a sickle gene.
- Pattern "AS"
- Sickle cell trait: one normal gene and one sickle gene.
- Pattern "SS" or "S-beta thalassaemia"
- Forms of sickle cell disease. They can look alike on one report, which is why parents are sometimes tested too.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
When results mislead
When can a sickle cell test give the wrong answer?
No blood test is perfect. These are the situations where a haematologist will read the result with extra care or repeat it.
A young baby
Babies are born with mostly foetal haemoglobin. Sickle haemoglobin builds up over the first months of life, so a solubility test in a newborn can come back negative even when the baby has the disease.
What is used instead
- HPLC or electrophoresis
- DNA testing where the pattern is unclear
A recent blood transfusion
Donated blood carries normal haemoglobin. For some months afterwards it dilutes the person's own haemoglobin, which can hide sickle haemoglobin or make disease look like trait.
Always tell the laboratory about any transfusion.Very low haemoglobin
When there is too little haemoglobin in the sample, the tube may not turn cloudy enough to read. The test can then look negative when it is not.
Low iron or thalassaemia
Low iron can lower the HbA2 level and hide beta thalassaemia trait. Some rare haemoglobin variants can also give a cloudy tube without true sickle haemoglobin. Confirmation and, at times, parent testing sort these out.
Commonly believed
What do families often get wrong about a positive screen?
"The screening test was positive, so my child has sickle cell disease."
Not necessarily. Most people who screen positive in India turn out to carry the trait, not the disease. Only the confirmatory test can tell you which. Please do not start medicines or change your child's routine on the strength of the screen alone.
"It is only the trait, so we can ignore it."
The trait rarely causes illness, but it matters for the next generation. If two people with the trait have children, each child can inherit the disease. Keep the report and share it before marriage or pregnancy.
"The test was negative years ago, so there is no need to test again."
A negative test done in infancy, after a transfusion, or with a very low haemoglobin may have missed sickle haemoglobin. If there are symptoms or a family history, ask for a confirmatory test now.
Before you decide anything
What can a confirmatory report not tell you?
A confirmatory report tells you which haemoglobin types are present. It does not tell you how often someone with the disease will have pain, which complications they may face, or which treatment will suit them. Those answers come from the haematologist who follows the person over time.
Reference ranges differ between laboratories
Each laboratory sets its own normal ranges for its machine. A value marked high or low on one report may sit differently on another. A single result is always read alongside symptoms, the blood count and, where needed, a repeat test. Do not compare your report with a relative's line by line.
Where CION fits in
If you already have a screening or confirmatory report, CION's haematology team can read it with you, explain the pattern, and coordinate any further test with a qualified laboratory. Bring every earlier report, the status card if you have one, and details of any transfusion.
This page explains the tests. It cannot tell you what your own report means.Questions we are asked
Common questions about the solubility test and confirmation
My solubility test is positive. Do I have sickle cell disease?
You may, but it is more likely that you carry the trait. The solubility test only shows that sickle haemoglobin is present. It cannot tell one sickle gene from two. Ask for HPLC or haemoglobin electrophoresis, and have the report read by a haematologist before you draw any conclusion.
Is HPLC better than electrophoresis?
Both are accepted ways to confirm sickle haemoglobin and measure the other types. HPLC is widely used in Indian laboratories and gives measured amounts. Electrophoresis separates the types on a gel or in a fine tube. Which one you get depends on the laboratory. What matters most is that a haematologist interprets the result.
Can the test be done on a newborn baby?
Yes, but not with the solubility test. A young baby has mostly foetal haemoglobin, so the solubility test can miss the disease. Newborn testing uses HPLC or a similar laboratory method, sometimes on a heel-prick sample. If the pattern is unclear, the test may be repeated later or a DNA test may be suggested.
My father had a blood transfusion recently. Can he be tested?
He can, but the result may be hard to read. Transfused blood carries normal haemoglobin, which can hide sickle haemoglobin for some months. Tell the laboratory and the doctor about the transfusion. The haematologist may suggest waiting, testing close relatives, or using a DNA test instead.
Do I need to fast before the test?
No. Neither the solubility test nor the confirmatory test needs fasting. It is a simple blood sample from a finger or a vein. If other blood tests are being done on the same day, such as a sugar test, follow the instructions for those. Carry any earlier reports with you.
Where can I get a confirmatory test in Telangana or Andhra Pradesh?
Positive samples from government screening are usually sent for confirmation through the programme. Many private laboratories in Hyderabad and district towns also offer HPLC. Ask the centre that screened you where the sample goes. Scheme rules change, so check the current arrangement at your nearest government health centre.
Can the confirmatory report say trait when it is really disease?
It can happen, though not often. A recent transfusion, or sickle haemoglobin combined with beta thalassaemia, can make the pattern look unusual. This is why the doctor reads the report with the blood count, symptoms and family history, and sometimes asks to test the parents or to do a DNA test.
What should we do once the result is confirmed?
If it is trait, keep the report safe and share it with your partner before planning a family. If it is disease, ask for regular follow-up with a haematologist, who will plan vaccines, infection prevention and monitoring. CION's haematology team can go through the report with you and coordinate the next steps.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Sources
- NHS — Sickle cell disease
- National Heart, Lung, and Blood Institute — Sickle cell disease
- American Society of Hematology — Blood disorders: patient education
- National Health Mission — National Health Mission
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Sickle Cell Screening: Who Should Be TestedWho is offered the screening test in the first placeSickle Cell Trait vs DiseaseIf your confirmed report says AS or SSThe National Sickle Cell Elimination MissionFree screening, confirmation and the status cardSickle Cell in PregnancyIf you are planning a familySickle Cell DiseaseThe full guide to the condition
Talk to us
Have a sickle cell test report?
Share it with us. CION's haematology team will read it with you, explain the pattern and help arrange any further test you need. One helpline serves every CION centre.