Which of the following is NOT a liver function test (LFT)? alkaline phosphatase bilirubin PT (prothrombin time) LDH/LD ammonia

The liver function tests (LFTs) include:

1. Alkaline phosphatase: This enzyme is found in many body tissues but is primarily found in the liver. High levels may indicate liver damage.

2. Bilirubin: This is a waste product from the breakdown of red blood cells. The liver processes bilirubin, so increased levels may indicate liver disease.

3. PT (prothrombin time): This test measures how long it takes for your blood to clot. While it can be affected by liver function, it is not a direct measure of liver function.

4. LDH/LD (Lactate dehydrogenase): This enzyme is found in many body tissues, including the liver. High levels can indicate tissue damage, including liver damage.

5. Ammonia: The liver converts ammonia to urea, which is excreted in urine. High levels of ammonia can indicate liver disease.

So, all of the options listed are related to liver function in some way. However, PT (prothrombin time) is not a direct measure of liver function, but rather a measure of the liver's ability to synthesize clotting factors. Therefore, PT (prothrombin time) could be considered as NOT a liver function test (LFT) in the strictest sense.