Doctors use two types of blood tests to check for pregnancy:

1. Quantitative blood test (or the beta hCG test) measures the exact amount of hCG in your blood. So it can find even tiny amounts of hCG. ...
2. Qualitative hCG blood tests just check to see if the pregnancy hormone is present or not. So it gives a yes or no answer.

Tests for 1st Trimester of pregnancy

- Hemoglobin
- Hemoglobin electrophoresis
- TSH Thyroid profile, lipid profile , KFT, LFT
- Blood group
- Hepatitis b and C
- Blood sugar
- VDRL
- HIV
- Trans veginal scan for fetal wellbeing
- Blood B HCG
- Double marker test
- NT & NB scan
- Amniocentesis in special cases
- Alpha-fetoprotein (AFP) test or multiple marker test
- Chorionic villus sampling
- Cell-free fetal DNA testing
- Percutaneous umbilical blood sampling (withdrawing a small sample of the fetal blood from the umbilical cord)
- Ultrasound scan

Tests for 2nd Trimester of pregnancy

- CBC
- RPR, a rapid plasma reagin test for syphilis
- sexually transmitted infections (STIs)
- Urine test
- Bacterial vaginosis
- Ultra sound scan
- Thyroid profile
- One-hour glucose tolerance test (Glucola)
- Triple screen test

In the second trimester, all women under the age of 35 should be offered a triple screen test. This is also sometimes called “multiple marker screening” and “AFP plus.” During the test, the mother’s blood is tested for three substances. These are:

- AFP, which is a protein produced by the fetus
- hCG, which is a hormone that’s produced in the placenta
- estriol, which is a type of estrogen produced by both placenta and fetus
- Ultrasound with a method called the “maximum vertical pocket.”

Tests for 3rd Trimester of pregnancy

Group B Streptococcus Screening

- Ultra sound 
- Target scan

STI Tests

During the third trimester, your doctor might also check for sexually transmitted infections (STIs). Depending on your risk factors, your doctor might test for:

- Chlamydia
- HIV
- syphilis
- gonorrhea