Repeated USMLE Questions Step 1 | Review

Q- A patient is prescribed heparin. Which one of the following laboratory tests is used to monitor its effectiveness?

A- Bleeding time

B- International normalized ratio (INR)

C- Platelet count

D- Partial thromboplastin time (PTT)

D- Partial thromboplastin time (PTT)- Heparin prolongs partial thromboplastin time (PTT) and is monitored using this test. INR is used to monitor warfarin’s effect.

Q- Which one of the following types of lung cancer could be accompanied by Horner’s syndrome?

A- Adenocarcinoma of the lung

B- Pancoast tumor

C- Small cell lung cancer

D- Squamous cell lung cancer

B- Pancoast tumor- Also known as non-small cell lung cancer. It occurs at the apex of the lung. It may involve the brachial plexus, stellate ganglion, and the sympathetic chain.

Q- Which one of the following vitamin deficiencies may cause megaloblastic anemia associated with glossitis and angular stomatitis?

A- Folate deficiency

B- Vitamin B12 deficiency

C- Vitamin C deficiency

D- Vitamin D deficiency

B- Vitamin B12 deficiency- It is the only type of anemia that can cause megaloblastic anemia with infections and neurological symptoms.

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