| Course | PA 533 Obstetrics & Gynecology |
|---|---|
| Week | 3 |
| Paper type | Physiologic adaptation write-up |
| Length | About 610 words, 5 pages |
| Format | APA 7 student paper |
| School | Chamberlain University |
| Program | Master of Physician Assistant Studies (MPAS) |
| Updated | October 2026 |
Free sample paper for PA 533 Week 3
Physiologic Adaptation Write-Up: A Creatinine of 0.48 mg/dL and a BUN of 6 at 24 Weeks Read Against Pregnancy Ranges, Written Down as Belonging Here, and the Value of 0.9 That Would Not
Student Name
Chamberlain University
PA 533: Obstetrics & Gynecology
Instructor Name
Month Day, Year
Physiologic Adaptation Write-Up: A Creatinine of 0.48 mg/dL and a BUN of 6 at 24 Weeks Read Against Pregnancy Ranges, Written Down as Belonging Here, and the Value of 0.9 That Would Not
The Values
At L.M.'s 24-week visit, the metabolic panel showed serum creatinine 0.48 mg/dL and blood urea nitrogen 6 mg/dL. The laboratory flagged both as low against its adult reference range of 0.6 to 1.1 mg/dL for creatinine and 7 to 20 mg/dL for urea nitrogen.
Belongs Here, Written Down
These values belong in a healthy second-trimester pregnancy. That sentence is written in the chart because the laboratory's flag invites a reader to treat them as abnormal, and an unwritten judgment cannot be checked. In pregnancy, serum creatinine typically falls to around 0.4 to 0.6 mg/dL by the second trimester, and urea nitrogen falls as well (Cheung & Lafayette, 2013).
Mechanism, Kept Short
Blood flow to the kidneys rises by roughly half or more in pregnancy, driven by vasodilation and an expanded plasma volume. Glomerular filtration rises with it, by about 40 to 50 percent, beginning early and peaking in the second trimester. A higher filtration rate clears creatinine and urea faster, so their blood levels fall.
How Far, and When
The rise in filtration starts within the first weeks after conception, is close to its peak by the end of the first trimester and stays high until late in the third trimester, when it may fall slightly. Values return to the prepregnancy baseline within a few months after birth. L.M.'s values, at 24 weeks, sit where this timeline predicts.
Where the Explanation Stops
The adaptation explains low values. It does not explain a creatinine that is normal by nonpregnant standards. A creatinine of 0.9 mg/dL in the second trimester, inside the laboratory's normal range, would be high for pregnancy and could mean reduced kidney function, preeclampsia affecting the kidneys or chronic kidney disease that the pregnancy is unmasking. The laboratory would not flag it, which is why the reader must know the pregnancy range.
The Range on the Report
The laboratory report uses adult nonpregnant reference ranges. This write-up states the pregnancy range beside the result and asks the prenatal team to read future creatinine values against it. A creatinine above about 0.8 mg/dL during pregnancy has been suggested as a level that warrants further evaluation (Cheung & Lafayette, 2013).
Bearing on the Rest of the Care
L.M.'s due date was set by the first-trimester ultrasound, so the 24-week timing is reliable (American College of Obstetricians and Gynecologists, 2017). Blood pressure at the visit was 108/64, lower than before pregnancy, another normal adaptation. Urine protein was negative.
Other Values Read the Same Way
The same panel showed a bicarbonate of 21 mmol/L, slightly below the nonpregnant range. That also belongs here: pregnancy increases breathing, lowering carbon dioxide, and the kidneys compensate by excreting bicarbonate. Hemoglobin was 11.2 g/dL, within the expected range for the second trimester because plasma volume rises more than red cell mass. Alkaline phosphatase was mildly raised, from the placenta. Each of these is written in the chart as expected for pregnancy so that none triggers a workup by itself.
What Would Prompt Action
A rising creatinine on two visits, new protein in the urine or blood pressure of 140/90 or higher would each prompt evaluation for preeclampsia or kidney disease, whatever the absolute value.
References
American College of Obstetricians and Gynecologists. (2017). Methods for estimating the due date (Committee Opinion No. 700). Obstetrics and Gynecology, 129(5), e150-e154. https://doi.org/10.1097/AOG.0000000000002046
Cheung, K. L., & Lafayette, R. A. (2013). Renal physiology of pregnancy. Advances in Chronic Kidney Disease, 20(3), 209-214. https://doi.org/10.1053/j.ackd.2013.01.012
The Chamberlain PA 533 Week 3 instructions
For week three you write up a laboratory value that reflects normal pregnancy physiology. Name the value with its number and the reference range it is being read against, and then state plainly that it belongs in pregnancy at this stage; most drafts assume this rather than writing it. Give the mechanism briefly. Say how far the value moves and when in pregnancy, and when it returns. Then mark where the explanation stops: which value would not be explained by the adaptation and would need investigation. Address the range printed on the laboratory report and how future values should be read. Where other flagged values on the same panel share the explanation, apply it to them too. Cite a source for pregnancy ranges.
How this PA 533 Week 3 example is built
The write-up opens with creatinine 0.48 and urea nitrogen 6 flagged low against adult ranges. A belongs-here section states the claim and cites Cheung and Lafayette on second-trimester values near 0.4 to 0.6. The mechanism section explains rising renal blood flow and a filtration increase of about 40 to 50 percent. A timing section places the change from early pregnancy to the third trimester and its reversal after birth. The stopping point is a creatinine of 0.9, normal on the report but high for pregnancy. A section asks the team to read future values against the pregnancy range, with 0.8 as a threshold for evaluation. Later sections note the due date's reliability, apply the same reading to bicarbonate, hemoglobin and alkaline phosphatase and list triggers such as protein or pressure of 140/90.
Where the points sit in the PA 533 Week 3 rubric
The heaviest marks go to the positive claim. A write-up that explains the mechanism but never states that the value belongs loses the most, because the judgment remains unwritten. Faculty then check the range: reading a pregnancy value against nonpregnant ranges with no comment costs points. A concise mechanism scores well; long physiology lectures cost points. Timing of the change is expected. The section on where the explanation stops is weighted heavily, since it marks the boundary between reassurance and investigation. Applying the reasoning consistently to other flagged values earns marks. A cited source for pregnancy-specific ranges is expected.
PA 533 Week 3 help: mistakes that cost points
A frequent problem with this write-up is explaining the physiology at length without ever saying the value is normal for pregnancy. Pass along the value and gestational age from your case, and the write-up built for you would name the range it is read against, state that it belongs, give the mechanism briefly and time the change. The value that would fall outside the adaptation is named. Other flagged values from the same panel are read the same way where they share the explanation. If your value is hemoglobin, thyroid function or blood pressure, the structure holds with different numbers. Confirm the pregnancy ranges you quote against your course's reference.
Get a PA-533 Week 3 example written to your instructions
Send the Week 3 instructions with the value or finding you have been assigned, and a custom write-up is built around it and returned inside 24 to 48 hours. The first one is free. If your section wants a particular laboratory result or examination finding covered, name it and the example is written on that one.
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PA 533 Week 3 questions, answered
How many values should the write-up cover?
One, in most sections, done properly. A paper covering six changes at a paragraph each has room for mechanism and nothing else, and mechanism is the cheapest part of this assignment. Where instructions ask for several, keep the timing and the limit on each and cut the physiology, because those two are what the points are attached to.
What if the value in my case really is abnormal?
Then say so and show the work that got you there. This week is not an instruction to call everything expected; it is an exercise in knowing which explanation applies. A paper arguing that a finding sits past what pregnancy accounts for, with the size and the week to support it, is answering the same question and usually marks well.
Does the write-up need a case, or can it be general?
Nearly every section supplies one, and where none is given the paper is stronger for inventing a patient at a stated week and staying with her. A general account of pregnancy physiology has nothing to be right or wrong about. Anchoring the value to one week forces the timing statement the assignment is really testing.
Where can I find a free PA 533 Week 3 sample paper?
This page carries the full PA 533 Week 3 write-up showing why a creatinine of 0.48 at 24 weeks belongs in a healthy pregnancy.
What creatinine would worry the writer in the PA 533 Week 3 sample?
A value of 0.9 mg/dL, normal on an adult report but high for the second trimester, which could signal reduced kidney function or preeclampsia.