Phalen test is done for?
**Core Concept**
The Phalen test is a clinical examination technique used to diagnose median nerve compression at the wrist, specifically carpal tunnel syndrome. This test assesses the patient's symptoms by passively flexing the wrist to reproduce the symptoms of median nerve compression.
**Why the Correct Answer is Right**
The Phalen test is based on the principle that flexion of the wrist increases the pressure within the carpal tunnel, compressing the median nerve and exacerbating symptoms. This compression can lead to numbness, tingling, or weakness in the hand, particularly in the thumb, index, and middle fingers. The median nerve is the primary nerve affected in carpal tunnel syndrome, and the Phalen test is a useful diagnostic tool to evaluate its function.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the Phalen test is not used to diagnose radial nerve compression.
**Option B:** This option is incorrect because the Tinel sign is a different clinical examination technique used to diagnose nerve regeneration or compression, not median nerve compression at the wrist.
**Option C:** This option is incorrect because the Phalen test is not used to diagnose ulnar nerve compression, which affects a different set of nerves and muscles in the hand.
**Clinical Pearl / High-Yield Fact**
The Phalen test is a simple and effective way to diagnose carpal tunnel syndrome, but it's essential to consider other factors, such as the patient's symptoms, medical history, and physical examination findings, to make an accurate diagnosis.
**Correct Answer: C.**