| Course | PA 522 Comprehensive Clinical Module Endocrinology |
|---|---|
| Week | 4 |
| Paper type | Suppression and stimulation set |
| Length | About 700 words, 6 pages |
| Format | APA 7 student paper |
| School | Chamberlain University |
| Program | Master of Physician Assistant Studies (MPAS) |
| Updated | October 2026 |
Free sample paper for PA 522 Week 4
Suppression and Stimulation Set: A Captopril Challenge With Aldosterone Falling Only 7 Percent Over Two Hours, Renin Staying Below 0.5 and Cortisol Drifting Down Beside Them
Student Name
Chamberlain University
PA 522: Comprehensive Clinical Module Endocrinology
Instructor Name
Month Day, Year
Suppression and Stimulation Set: A Captopril Challenge With Aldosterone Falling Only 7 Percent Over Two Hours, Renin Staying Below 0.5 and Cortisol Drifting Down Beside Them
The Protocol Is Part of the Result
Test: captopril challenge, one of the confirmatory tests the primary aldosteronism guideline lists (Funder et al., 2016).
Preparation: lisinopril and hydrochlorothiazide stopped five weeks earlier; blood pressure controlled with long-acting verapamil and doxazosin, which interfere little with the test. Potassium corrected with oral potassium chloride to 4.2 mmol/L the day before. Usual salt intake, not restricted.
Procedure: M.T. was upright from waking, then seated for the test. At 9:00 a.m. blood was drawn for aldosterone, renin activity and cortisol. Captopril 50 mg was given by mouth. M.T. stayed seated, and samples were repeated at 60 and 120 minutes. Blood pressure was checked every 30 minutes.
The Results
Table 1
Captopril Challenge Results
| Time (minutes) | Aldosterone (ng/dL) | Renin activity (ng/mL/h) | Cortisol (mcg/dL) | Blood pressure (mm Hg) |
|---|---|---|---|---|
| 0 | 18.2 | 0.3 | 14.1 | 150/90 |
| 60 | 17.6 | 0.3 | 11.6 | 138/84 |
| 120 | 16.9 | 0.4 | 9.8 | 134/82 |
Note. Note. Samples seated; units in the column headings.
Walk the Whole Curve
Starting point: aldosterone 18.2 with renin 0.3, the same pattern as the screening pair, now on medicines that do not distort it and with potassium corrected.
Between: at 60 minutes aldosterone had fallen by 0.6 ng/dL and renin had not moved, although blood pressure fell 12 points, showing the captopril was absorbed and working.
Endpoint: at 120 minutes aldosterone was 16.9, a fall of 1.3 ng/dL or about 7 percent from baseline, and renin was 0.4.
Against the trend: renin rose by 0.1 at 120 minutes, which is within the assay's variation and not a real response.
Quote the Criterion, Name Its Source
The guideline describes the expected normal response: captopril, by blocking converting enzyme, lowers angiotensin II, and aldosterone normally falls by more than 30 percent while renin rises; in primary aldosteronism aldosterone stays high and renin stays suppressed (Funder et al., 2016). M.T.'s aldosterone fell 7 percent, far short of 30, and renin stayed suppressed. The test is read as positive, confirming autonomous aldosterone production.
The Cortisol Line
Cortisol fell from 14.1 to 9.8, the normal morning decline. Corticotropin also falls through the morning and adds a little to aldosterone's fall, so part of the 7 percent drop may reflect that rhythm rather than any response to captopril. That makes the result, if anything, stronger.
Suppression and Stimulation Read Oppositely
This is a suppression test: a normal gland is expected to fall, and failure to fall is abnormal. A stimulation test, such as the cosyntropin test for adrenal insufficiency, reads the other way: a normal gland is expected to rise, and failure to rise is abnormal. Mixing up the direction is the commonest error in reading these sets.
What Would Invalidate the Run
Low potassium at the time of testing, which lowers aldosterone and could hide a true excess; any converting enzyme inhibitor, angiotensin blocker, diuretic or mineralocorticoid blocker taken in the weeks before, which raise renin; testing lying down; a captopril dose that was vomited or not absorbed, shown here to be absorbed by the fall in blood pressure; and acute illness. None was present. The captopril challenge also has a known rate of equivocal results, and some centers prefer saline infusion, so the decision to use it is recorded with the reason: M.T. has a history of mild heart failure symptoms with salt loads, making a 2-liter saline infusion less safe (Young, 2019).
Safety During the Test
Captopril can lower blood pressure sharply in someone who is volume depleted, and rarely causes swelling of the lips or tongue. M.T. was seated throughout, had a cannula in place, and was asked to report lightheadedness. The lowest pressure, 134/82, caused no symptoms. No swelling occurred. M.T. was observed for 30 minutes after the last sample and went home with the usual evening medicines.
References
Funder, J. W., Carey, R. M., Mantero, F., Murad, M. H., Reincke, M., Shibata, H., Stowasser, M., & Young, W. F., Jr. (2016). The management of primary aldosteronism: Case detection, diagnosis, and treatment: An Endocrine Society clinical practice guideline. The Journal of Clinical Endocrinology and Metabolism, 101(5), 1889-1916. https://doi.org/10.1210/jc.2015-4061
Young, W. F., Jr. (2019). Diagnosis and treatment of primary aldosteronism: Practical clinical perspectives. Journal of Internal Medicine, 285(2), 126-148. https://doi.org/10.1111/joim.12831
PA 522 Week 4 instructions, in plain terms
In week four you interpret a suppression or stimulation test. Begin with the protocol, because a value at a given time means different things under different protocols: the drug and dose, the preparation including medicines stopped and electrolytes corrected, the patient's position and the sampling times. Reproduce the results in a table with times in one column and values in others, units in the headers. Then walk every point in order, the starting value, the shape in between and the endpoint, and comment on any point that moves against the trend. Quote the interpretive criterion and name its source. Explain whether this is a test in which a normal gland should fall or rise. List what could invalidate the run and show whether each was present. Note how safety was managed.
How the PA 522 Week 4 example is put together
The set opens with the captopril challenge, cites the guideline, and records five weeks off lisinopril and hydrochlorothiazide, verapamil and doxazosin in their place, potassium corrected to 4.2 and seated sampling at 9:00. Table 1 lists aldosterone, renin activity, cortisol and blood pressure at 0, 60 and 120 minutes. The walk-through covers the baseline pattern, a 12-point fall in blood pressure showing absorption, the 7 percent aldosterone fall at the endpoint and a renin change of 0.1 within assay variation. The criterion of a normal fall above 30 percent is quoted. A section explains how the morning cortisol decline makes the result stronger. Another contrasts suppression with stimulation. The invalidation list is checked item by item, saline infusion is set aside for salt sensitivity, and a safety section closes.
Reading the PA 522 Week 4 grading rubric
The rubric for this set gives the most weight to the protocol and the full curve. Results reported without preparation, medicines stopped or potassium status lose heavily, since those conditions decide whether the run is valid. Reading only the endpoint costs points; faculty expect every time point to be addressed, including any that move against the trend. The criterion must be quoted as written in a named source, and the conclusion must follow from it. Credit also goes to stating whether the test suppresses or stimulates and reading it in the right direction, a common source of error. A list of invalidating factors with each one checked earns a solid share. Safety notes add a small amount. A numbered table with units in the headers completes the format.
Common PA 522 Week 4 mistakes, and how to avoid them
The most frequent problem with dynamic test write-ups is reading the last number against a remembered cutoff. Share the protocol and results from your case, and the write-up prepared for you would open with the preparation and procedure, lay the values out by time and walk the whole curve point by point. The criterion is quoted from the source your course uses, and the direction of the test is stated plainly. Factors that could invalidate the run are listed and checked against your case. If your set is a stimulation test, such as cosyntropin or glucagon, the reading is reversed accordingly. Confirm the protocol times and cutoffs against your own course material before relying on the interpretation.
Get a PA-522 Week 4 example written to your instructions
Send the protocol your assignment names, the timed results it supplies and the instructions themselves, and a custom PA-522 Week 4 set is written against those figures and returned inside 24 to 48 hours, the first one free. If your section specifies which published threshold to use, include it, since a sample argued to a different cutoff reads as an error.
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PA 522 Week 4 questions, answered
The assignment gives results but no protocol. What does the sample do?
It states the assumption out loud and reads the table against it, which is what faculty want when information is missing. The sample names the protocol it has assumed, explains why that one fits the sampling times given, and notes which part of the reading would change under the common alternative. Send the assignment text and any laboratory handout, and the assumption is narrowed accordingly.
Does the set need a table, or can the results run in the prose?
A table is easier to mark and easier to check, and most finished versions use one. Where a section bans tables, the sample runs the values in sequence with times attached to each, and the reading then works harder to keep the shape visible. Attach any formatting requirement with your request and the sample is built to it from the start.
How much physiology belongs in the reading?
Only enough to explain why the criterion is the criterion. A sentence on what the challenge was meant to do to the axis earns its place; a paragraph on receptor mechanics does not. The bulk of the words belong to the timed figures themselves, since this assignment is graded on interpretation of a run rather than on recall of the underlying biology.
Where can I find a free PA 522 Week 4 sample paper?
The full PA 522 Week 4 captopril challenge write-up is on this page, with the protocol first, three timed samples and the Endocrine Society criterion quoted.
How does the PA 522 Week 4 sample judge the captopril result?
A normal aldosterone falls by more than 30 percent after captopril, and the patient's fell about 7 percent with renin still suppressed, so the test is positive.