Short answer
Most blood tests need no special preparation. Fasting sugar and some cholesterol (lipid) tests need you to eat nothing but water for 8 to 12 hours beforehand, so they are usually done in the morning. Take your usual medicines unless your doctor says otherwise. The blood draw takes a few minutes.
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- Dhruva Hospitals, Kadapa
Common blood tests
| Test | What it checks |
|---|---|
| Complete blood count (CBC) | Haemoglobin, white cells and platelets: anaemia, infection and some blood conditions |
| Blood sugar and HbA1c | Diabetes and how well it is controlled |
| Lipid profile | Cholesterol and triglycerides: heart and stroke risk |
| Kidney function (urea, creatinine, electrolytes) | How well the kidneys are working |
| Liver function tests | Liver health |
| Thyroid tests (TSH) | An underactive or overactive thyroid |
Which tests need fasting?
- Fasting blood sugar: at least 8 hours with nothing but water
- Lipid profile: some labs and doctors ask for fasting, usually 8 to 12 hours; ask when you book
- HbA1c, CBC, thyroid and most other tests: no fasting needed
How to prepare
- Drink water as usual, as it makes the blood draw easier.
- Take your regular medicines unless the doctor tells you to stop one, such as a blood thinner before some tests.
- Bring your prescription and earlier reports, so the results can be compared.
- Tell the staff if you feel faint or anxious about needles, so they can help you feel comfortable.
On the day
A small amount of blood is taken from a vein, usually inside the elbow. You feel a brief scratch. Afterwards, press on the cotton for a few minutes to reduce bruising. Your doctor will explain the results; ask if anything is unclear.
Diagnostics at Dhruva Hospitals
Our in-house laboratory does routine and specialised blood tests on fully automated analysers, hormone tests and semen analysis. The hospital also has ECG, digital X-ray, and ultrasound with Doppler. Call +91 99599 59694 for test timings.
Common questions
Can I drink tea or coffee before a fasting test?
No. Only plain water is allowed during the fasting time. Tea, coffee and milk can change the results.
Can I get tests done without a doctor’s prescription?
Call us to ask. A doctor’s advice helps you choose the right tests and understand the results, especially if any value is abnormal.
Read next
This article is general information, not a diagnosis or treatment plan. In an emergency, call +91 90368 52311.