Kidney Function Trends

Purpose

The purpose of this section is to analyze kidney-related laboratory trends over time and evaluate:

Kidney filtration function.
Hydration-related markers.
Protein metabolism indicators.
Evidence of kidney injury or disease.

The primary markers reviewed include:

Creatinine
Estimated Glomerular Filtration Rate (eGFR)
Blood Urea Nitrogen (BUN)
BUN/Creatinine Ratio
Urinalysis findings

Overview

The laboratory record demonstrates stable and preserved kidney function throughout the Health Inventory.

The major findings are:

Creatinine has remained normal.
eGFR has remained in a healthy range.
Urinalysis has remained normal.
No evidence of protein loss or kidney damage has been identified.
BUN has occasionally been elevated, likely influenced by dietary protein intake.

The overall kidney health summary is:

Preserved kidney filtration with no laboratory evidence of kidney disease. Elevated BUN values appear to require interpretation within the context of high protein intake and hydration status rather than reduced kidney function.

1. Creatinine Trends

What Creatinine Measures

Creatinine is a waste product produced by normal muscle metabolism.

It is commonly used to estimate kidney filtration.

Higher creatinine levels may indicate reduced kidney function.

Creatinine Trend

Date	Creatinine	Interpretation
June 2024	0.92 mg/dL	Normal
November 2024	0.88 mg/dL	Normal
2025 Function Health testing	Normal	Preserved function
June 2026	Normal	Preserved function

Interpretation

Creatinine has remained stable and within normal limits.

This is one of the most important indicators that kidney filtration has remained intact.

2. Estimated Glomerular Filtration Rate (eGFR)

What eGFR Measures

eGFR estimates how effectively the kidneys filter blood.

Generally:

Higher values indicate better filtration.
Lower values may indicate reduced kidney function.

eGFR Trend

Date	eGFR	Interpretation
June 2024	81	Normal kidney function
November 2024	83	Normal kidney function
June 2026	Preserved	Stable

Interpretation

The eGFR trend demonstrates:

Stable kidney filtration.
No progressive decline.
No evidence of chronic kidney disease.

For an older adult, maintaining this level of kidney function is a significant positive health marker.

3. Blood Urea Nitrogen (BUN) Trends

What BUN Measures

BUN measures the amount of urea nitrogen in the blood.

Urea is produced when the body breaks down protein.

BUN may increase due to:

High protein intake.
Dehydration.
Fasting.
Reduced kidney filtration.

BUN Trend

Date	BUN	Interpretation
June 2024	40 mg/dL	Elevated
November 2024	33 mg/dL	Elevated
Later testing	Monitored	Stable

Interpretation

The elevated BUN values are important but should not be interpreted alone.

In your case, the elevated BUN occurs with:

Normal creatinine.
Normal eGFR.
Normal urinalysis.

This pattern generally suggests increased protein metabolism rather than kidney failure.

4. BUN/Creatinine Ratio

Findings

The BUN/Creatinine ratio has been elevated.

Interpretation

A high BUN/Creatinine ratio can occur with:

High protein intake.
Increased meat consumption.
Lower fluid intake.
Fasting.

Your dietary pattern includes:

High animal protein intake.
Low carbohydrate intake.
Periodic fasting.

Therefore, this marker should be interpreted in that context.

5. Urinalysis Trends

Purpose

Urinalysis provides information about:

Protein leakage.
Blood loss.
Infection.
Kidney damage.

Findings

Repeated urinalysis has shown:

Normal:

No protein.
No blood.
No glucose.
No infection markers.

Interpretation

Normal urinalysis is an important reassuring finding.

There is no laboratory evidence of:

Kidney injury.
Protein loss.
Urinary tract disease.

6. Kidney Function and Carnivore Diet

Lifestyle Context

Beginning January 2024:

Diet:

Beef.
Eggs.
Butter.
Salt.
Raw whole milk.

This represents a significantly higher protein and animal-food intake compared with a typical diet.

Laboratory Response

Observed:

Positive:

✅ Normal creatinine
✅ Preserved eGFR
✅ Normal urinalysis
✅ Stable kidney function

Finding requiring interpretation:

⚠ Elevated BUN

Current Interpretation

The laboratory pattern does not suggest kidney damage.

The most likely explanation for the BUN elevation is:

Increased protein metabolism.
Dietary protein load.
Hydration differences.

Continued monitoring remains appropriate.

Kidney Health Summary Table

Category	Historical Finding	Current Status
Creatinine	Normal	Normal
eGFR	Preserved	Preserved
BUN	Occasionally elevated	Monitor
BUN/Creatinine Ratio	Elevated	Interpret with diet
Urinalysis	Normal	Normal
Kidney disease evidence	None	None

Relationship to Other Health Trends

Kidney Health and Metabolic Health

The combination of:

Low insulin.
Normal glucose.
Low inflammation.
Preserved kidney function.

suggests excellent metabolic health.

Kidney Health and Diet

The laboratory record provides an opportunity to monitor how a high-protein dietary pattern affects kidney markers over time.

Future quarterly testing will be valuable.

Current Kidney Assessment (2026)

Area	Status
Filtration	Excellent
Kidney injury markers	None identified
Protein leakage	None
Hydration markers	Monitor
Long-term monitoring	Appropriate

Physician Discussion Points

Questions for Dr. George

Is the elevated BUN/Creatinine ratio expected with my current high-protein diet?
Should hydration status be optimized before laboratory testing?
Are there additional kidney markers that would be useful for long-term monitoring?

Questions for Dr. Yoo

Does preserved kidney function affect cardiovascular risk interpretation?
Should kidney markers continue to be monitored quarterly?

Overall Interpretation

The kidney trend represents another strong area of health stability.

The laboratory record demonstrates:

Normal creatinine.
Preserved eGFR.
Normal urinalysis.
No evidence of kidney damage.

The only recurring finding is elevated BUN, which appears consistent with increased protein metabolism rather than impaired kidney function.

The most accurate summary is:

Kidney function remains excellent, with preserved filtration and no evidence of kidney disease. Elevated BUN values should continue to be monitored but interpreted in the context of dietary protein intake and hydration status.

Related Sections

This trend analysis connects directly with:

Section 6 — Lifestyle & Health Goals
Section 7.2.5 — Metabolic Trends
Section 7.2.7 — Thyroid Trends
Section 9 — Current Supplements & Diet Notes
Section 8 — Physician Consultation Summaries