a. Patient 1 in your hospital had laboratory tests done that revealed he has a l
ID: 3474311 • Letter: A
Question
a.
Patient 1 in your hospital had laboratory tests done that revealed he has a lower than normal plasma Na+ concentration and a lower than normal urine osmolarity. Give a reasonable or likely explanation why the osmolarity of the urine would be lower than normalin this patient.
b.
Patient 2 in your hospital had laboratory tests done that revealed a lower than normal plasma Na+ concentration and a higher than normal urine osmolarity. Based on a previous question in this Case Study, give the explanation why the plasma Na+ concentration would be lower than normal in this patient.
To be clear: for this Question you should look specifically to one of the Question above for your answer–i.e. which Case we covered would give you these laboratory results(of low plasma Na+concentration and a higher than normal urine osmolarity)? Once you figure out the Case, you should be able to create your explanation why the plasma Na+ concentration would be lower than normal in this patient
Explanation / Answer
a) Here the patient has low plasma sodium concentration and lower than normal urine osmolarity. This occurs in conditions like primary polydipsia and malnutrition in which the osmo receptors are reset producing dilute urine.
b) Here, the plasma concentration of sodium is low but high in the urine. This occurs because of the impaired ability of the kidneys to dilute the urine. This may occur due to increase in the levels of anti diuretic hormone.
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