You can get a sickle cell test through your primary care doctor, a hospital or community clinic, a prenatal or family-planning service, or a hematology center; in many countries newborns are also tested automatically at birth. The test is a simple blood sample, and the key investigation is hemoglobin electrophoresis or HPLC, which shows whether you have normal hemoglobin, sickle cell trait or sickle cell disease. This guide explains who should be tested, where to go, which tests are used and what the results mean for patients and the providers who order them.
What Sickle Cell Testing Looks For
Sickle cell disease (SCD) is an inherited blood disorder in which red cells contain an abnormal hemoglobin called hemoglobin S (HbS). When HbS releases oxygen it forms stiff chains that bend the cell into a sickle shape. Those cells block small vessels and break down early, causing pain and anemia.
The cause is a change in the HBB gene, which carries the instructions for the beta-globin part of hemoglobin. Everyone inherits two copies of this gene, one from each parent. Testing identifies which versions you carry.
- Two normal genes (HbAA): no sickle hemoglobin.
- One normal and one sickle gene (HbAS): sickle cell trait. Carriers are usually healthy but can pass the gene on.
- Two abnormal genes (HbSS, HbSC, HbS/beta thalassemia): forms of sickle cell disease.
Who Should Get a Sickle Cell Test?
Testing makes sense for anyone who does not know their status and has a reason to find out. Common situations include:
- Babies, through routine newborn screening programs.
- Couples planning a pregnancy or in early pregnancy, especially when either partner has a family history of trait or disease.
- People with a relative who has sickle cell disease or trait.
- Anyone with unexplained anemia, recurrent bone or chest pain, jaundice or early stroke.
- Athletes and military recruits where screening policies apply.
- Patients before certain surgery or anesthesia, where status affects care.
The sickle gene is most common in people with African, Mediterranean, Middle Eastern, Indian and Caribbean ancestry, but ancestry is not a reliable filter. Families are often more mixed than records suggest, and people of European descent can carry the gene too, as discussed in whether Caucasians can get sickle cell disease. If you are unsure, testing is the only way to know.
Where Can I Get a Sickle Cell Test?
Access varies by country, but the main routes are similar almost everywhere.
| Where to go | Best for | What to expect |
|---|---|---|
| Primary care doctor or family physician | Adults and children who want to know their status | A referral for blood tests, results usually within days to a couple of weeks |
| Newborn screening program | All newborns where the program exists | A heel-prick sample in the first days of life; abnormal results are followed up |
| Antenatal or fertility clinic | Pregnant people and couples planning a family | Carrier screening, partner testing and genetic counseling if both carry a gene |
| Hospital hematology service | Suspected disease, unclear results, ongoing care | Specialist testing, DNA analysis and long-term follow-up |
| Community screening events | Communities with high carrier rates | Free or low-cost screening with referral if positive |
Some private laboratories sell direct-to-consumer hemoglobin tests. They can be convenient, but results should still be reviewed with a clinician, because interpretation depends on your blood count and iron status. When you book, ask specifically for a hemoglobinopathy screen or hemoglobin electrophoresis; a routine blood count on its own does not answer the question.
Types of Sickle Cell Tests
Several tests are used, each with a different role. For clinicians, sickle cell testing is covered in more laboratory detail in our professional guide.
| Test | What it shows | Limitations |
|---|---|---|
| Complete blood count (CBC) | Hemoglobin level, red cell size, signs of anemia | Cannot identify sickle hemoglobin |
| Blood smear | Sickled cells and other red cell changes under a microscope | Sickle cells are often absent in trait |
| Solubility test | Quick yes/no for the presence of HbS | Cannot tell trait from disease; unreliable in newborns |
| Hemoglobin electrophoresis or HPLC | Type and proportion of each hemoglobin (A, S, C, F, A2) | Recent transfusion can mask results |
| DNA (HBB gene) testing | The exact gene changes present | More costly; used for prenatal or unclear cases |
Electrophoresis or HPLC is the standard confirmatory test. In an adult with trait, HbA is typically the larger fraction and HbS a smaller one, usually below half. In HbSS disease, HbS is the dominant hemoglobin with no HbA, alongside a variable amount of fetal hemoglobin (HbF).
Reading Your Results and What Comes Next
A normal result means no sickle hemoglobin was found and no further action is needed. A trait result means you are a carrier; you do not have the disease, but a partner should be tested before or during pregnancy. If both partners carry a sickle gene, each pregnancy has a one in four chance of a child with sickle cell disease.
A result showing sickle cell disease leads to referral to a hematologist. Symptoms such as pain crises, fatigue, jaundice and chronic anemia stem from the short lifespan of sickle cells: around 10 to 20 days compared with about 120 days for normal red blood cells.
Early diagnosis matters because proven measures prevent harm. Children receive penicillin to prevent serious infection, full vaccinations, and transcranial Doppler scans to screen for stroke risk. Hydroxyurea reduces pain crises, and transfusions treat severe anemia. A stem cell transplant, which replaces the bone marrow that makes red cells, and newer gene therapies can cure the disease in selected patients.
Notes for Providers
- Order hemoglobin electrophoresis or HPLC rather than a solubility test when a definitive answer is needed.
- Check the transfusion history; donor blood can make results misleading for up to about three months.
- Interpret HbA2 and red cell indices together, since coexisting beta thalassemia or iron deficiency alters the pattern.
- Offer partner testing and genetic counseling when a pregnant patient has trait.
- Refer infants with a positive newborn screen to hematology promptly so preventive care can start early.
Key Takeaways
- A sickle cell test is a routine blood test available through primary care, hospitals, antenatal clinics and newborn screening.
- Hemoglobin electrophoresis or HPLC confirms whether you have normal hemoglobin, trait or disease.
- Knowing your status matters most before and during pregnancy.
- A diagnosis of sickle cell disease opens the door to preventive care that improves outcomes.
Frequently Asked Questions
Do I need to fast before a sickle cell test?
No. Sickle cell testing does not require fasting or special preparation. Tell the clinic if you have had a blood transfusion in the past few months, since it can affect the result.
How long do sickle cell test results take?
A blood count is usually back the same day. Electrophoresis or HPLC often takes a few days, and DNA testing can take longer depending on the laboratory.
Can a routine blood test show sickle cell trait?
Usually not. People with trait typically have a normal blood count and smear. Only a specific hemoglobin test such as electrophoresis or HPLC reliably detects it.
If I was tested as a baby, do I need testing again?
Newborn results are generally reliable, but many adults never received or cannot find them. If you are planning a family and do not have written results, ask your doctor to repeat the test.
