Protein in the Urine (Proteinuria): When Does It Matter?

Short Answer

Protein in the urine (proteinuria) does not always mean kidney disease. Fever, intense exercise, urinary tract infection, menstrual blood, and proteinuria related to standing can give a temporary result. According to the KDIGO 2024 guideline, a positive dipstick result is confirmed in the laboratory with the albumin/creatinine ratio (ACR). For chronic kidney disease to be diagnosed, the finding must last at least 3 months. Evaluate your result according to the laboratory reference range in your report.

How does it appear in your report?

• Dipstick in a complete urinalysis: This is the "Protein" or "PRO" line. The result is written as "negative," "trace," or with plus (+) signs.
• Albumin/creatinine ratio: It appears as "Urine microalbumin," "Albumin/Creatinine (spot urine)," "ACR," or "AKO." According to the Test Measurement Units document of the Turkish Ministry of Health, its unit is mg/g creatinine.
• Protein/creatinine ratio (PCR): Its unit is also mg/g creatinine.
• Protein in 24-hour urine: In the national standard, the unit is g/24 hours.
• Unit conversion: Some foreign reports use mg/mmol. According to KDIGO 2024, 30 mg/g is approximately 3 mg/mmol, and 300 mg/g is approximately 30 mg/mmol.
• e-Nabız: In e-Nabız (Türkiye's national health record app), the "My Tests" section lists results with reference values; out-of-range values are colored. You can compare your previous results with a graph.
• Decision limit: The laboratory specialist may add a decision limit depending on the method. Decision limits are marked with an asterisk (*) in the report and explained at the bottom.

"Microalbuminuria" is an old term. According to the TEMD 2026 guideline, ACR <30 mg/g is now defined as normal and ≥30 mg/g as increased albumin excretion.

Normal value and reference range

Category	ACR (mg/g)	ACR (mg/mmol)	PCR (mg/g)	Dipstick
A1: Normal or mildly increased	<30	<3	<150	Negative–trace
A2: Moderately increased	30–300	3–30	150–500	Trace–1+
A3: Severely increased	>300	>30	>500	1+ and above

Source: ACR categories from KDIGO 2024. PCR and dipstick equivalents taken from the 2016 short guideline of the Turkish Biochemical Society.

A reference range covers 95% of healthy people; about 1 in 20 healthy people may fall slightly outside the range. KDIGO 2024 states that urine albumin measurements can vary by more than 40% between laboratories depending on the method. For this reason, do your follow-up in the same laboratory if possible.

What does it mean if it is high?

Temporary causes are considered first. These are common and often harmless.

• Intense exercise: According to KDIGO and TEMD, heavy exercise in the last 24 hours increases urine albumin.
• Fever and acute illness: High fever and intercurrent illness raise protein temporarily.
• Urinary tract infection: A symptomatic infection can increase protein in the urine.
• Menstrual blood or blood in the urine: Blood mixed into the sample raises the result.
• Proteinuria related to standing (orthostatic): It increases during the day and disappears while lying down at night. According to KDIGO, it is seen in 2–5% of adolescents. The first morning urine is needed to distinguish this condition.
• Uncontrolled blood sugar, blood pressure, and heart failure: According to TEMD, marked hyperglycemia, high blood pressure, and heart failure can increase albumin excretion.
• Women and thin people: Because urine creatinine is lower, ACR may come out slightly higher.

If it is persistent, the following causes are investigated:

• Diabetes and hypertension: These are the most common causes of damage to the kidney filter. According to the Turkish Biochemical Society guideline, urine albumin also increases in hypertension, obesity, and vascular disease.
• Glomerular diseases: Marked albuminuria usually reflects damage to the kidney filter (glomerulus).
• Tubular and overflow proteinuria: Failure of the kidney tubules to reabsorb protein, or an increase in small proteins in the blood such as light chains, also causes proteinuria.
• Chronic kidney disease: According to KDIGO 2024, ACR ≥30 mg/g lasting at least 3 months is a marker of kidney damage.

The degree of albuminuria matters. According to TEMD 2026, at every eGFR level, as albuminuria increases, cardiovascular risk, progression of kidney disease, and the risk of death increase.

Read together with

• Protein + creatinine/eGFR: Chronic kidney disease is classified by eGFR (G1–G5) and albuminuria (A1–A3) together. For details, see the article on kidney screening after age 50.
• Protein + blood in urine (erythrocytes): According to KDIGO, if there is blood in the urine together with ACR ≥300 mg/g, a nephrology evaluation is recommended.
• Protein + leukocytes and nitrite: Infection can temporarily increase protein. Protein is checked again after the infection has cleared.
• Protein + glucose and ketones in urine: Suggests uncontrolled diabetes. Emergencies are described in the article on ketones in urine.
• Protein + edema + low blood albumin: The doctor evaluates for heavy protein loss through the kidney filter (nephrotic picture).
• Negative dipstick but diabetes present: The dipstick can miss low levels of albumin. In people with diabetes, screening is done with ACR.

Preparing for the test

• First morning urine: KDIGO 2024 prefers the first morning midstream urine in adults and children. This sample is also needed to rule out orthostatic proteinuria.
• Exercise: Do not do intense exercise in the 24 hours before the test.
• Situations to postpone: According to TEMD, a screening test is not done until fever, urinary tract infection, markedly high blood sugar, uncontrolled blood pressure, or a heart failure flare has resolved. Also wait out your menstrual period.
• 24-hour urine: According to the Ministry's Total Testing Process Guide, collection starts after the first morning urine has been passed into the toilet. The first urine of the next morning is also added to the container. The collected urine is taken to the laboratory without delay.
• A dipstick is not enough: KDIGO states that total protein dipsticks do not reliably detect low levels. A positive dipstick is confirmed by a laboratory measurement.

Which doctor, which test?

• A single positive dipstick, no symptoms: Family physician. ACR (or PCR) in the first morning urine, blood creatinine, and eGFR are requested.
• ACR came back high: KDIGO recommends confirming with a first morning urine if ACR in a random urine is ≥30 mg/g. According to NICE NG203, an ACR between 3 and 70 mg/mmol is confirmed with a new morning sample; at 70 mg/mmol and above, no repeat is needed.
• Diabetes: Family physician or endocrinology. According to TEMD 2026, ACR is checked once a year from diagnosis in type 2 diabetes and after 5 years in type 1 diabetes.
• Diagnosis of albuminuria: According to TEMD, at least 2 of 3 samples checked within 3–6 months must be high.
• Referral to nephrology: According to KDIGO, a nephrology evaluation is recommended if ACR is persistently >700 mg/g, if there is blood in the urine together with ACR ≥300 mg/g, or if eGFR is <30.
• Children and adolescents: Pediatric nephrology. Orthostatic proteinuria is common at this age and is distinguished with a morning urine sample.

In Türkiye

• How common is it? The population-based CREDIT study in Türkiye examined 10,748 adults. The prevalence of chronic kidney disease was 15.7%. Microalbuminuria was found in 10.2% and macroalbuminuria in 2%.
• Awareness is low: The 2016 guideline of the Turkish Biochemical Society reports that awareness of chronic kidney disease in Türkiye does not exceed 2%.
• Laboratory recommendation: The same guideline recommends that proteinuria and albuminuria be measured in random samples and reported as a ratio to creatinine. When creatinine is reported, eGFR should also be given in adults.
• Diabetes monitoring: The TEMD 2026 guideline recommends a complete urinalysis at every visit and an ACR once a year. If kidney disease is present, ACR is repeated every 3–6 months.
• Report unit: The national Test Measurement Units document uses mg/g creatinine for ACR and PCR, and g/24 hours for 24-hour protein.

When should you seek emergency care?

• If there is rapidly increasing swelling of the face, around the eyes, or in the legs, and a marked decrease in urine output, see a doctor the same day.
• If there is shortness of breath together with swelling, call 112 (the emergency number in Türkiye).
• If you cannot pass any urine all day, go to the emergency department.
• If you are pregnant and have a severe headache, vision problems, or sudden swelling, go to the obstetric emergency department without waiting.
• If the laboratory has called you about a critical value for a test such as creatinine, do what you are told without delay.

Related tests

• Lab Test Guide: all tests
• How to read urinalysis results
• Kidney screening after age 50: eGFR and albumin
• What do leukocytes in urine mean?
• What does a positive urine ketone result mean?

What changed? (October 2026)

• New page. It is consistent with the KDIGO 2024 chronic kidney disease guideline and the NICE NG203 confirmation rules.
• Screening recommendations in diabetes were written according to the TEMD Diabetes Mellitus Guideline 2026.

Sources

• Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney Int 2024;105(4S):S117-S314. https://kdigo.org/wp-content/uploads/2024/03/KDIGO-2024-CKD-Guideline.pdf (accessed October 2, 2026)
• National Institute for Health and Care Excellence. Chronic kidney disease: assessment and management (NG203). 2021. https://www.nice.org.uk/guidance/ng203 (accessed October 2, 2026)
• Abuşoğlu S, Aydın İ, Bakar F et al. (Turkish Biochemical Society). A short guideline on chronic kidney disease for medical laboratory practice. Turk J Biochem 2016;41(4):292-301. https://doi.org/10.1515/tjb-2016-0043 (accessed October 2, 2026)
• Süleymanlar G, Utaş C, Arınsoy T et al. A population-based survey of Chronic REnal Disease In Turkey: the CREDIT study. Nephrol Dial Transplant 2011;26(6):1862-1871. https://doi.org/10.1093/ndt/gfq656 (accessed October 2, 2026)
• Society of Endocrinology and Metabolism of Turkey (TEMD). Diabetes Mellitus ve Komplikasyonlarının Tanı, Tedavi ve İzlem Kılavuzu. 2026 (17th edition, April 2026). https://file.temd.org.tr/Uploads/Publications/guides/documents/diabetesmellitus2026.pdf (accessed October 2, 2026)
• Republic of Türkiye Ministry of Health, General Directorate of Health Services. Test Ölçüm Birimleri, Versiyon 2. 15.09.2021. https://dosyamerkez.saglik.gov.tr/Eklenti/41467/0/test-olcum-birimleri-versiyon-2-pdfpdf.pdf (accessed October 2, 2026)
• Republic of Türkiye Ministry of Health, General Directorate of Health Services. Tıbbi Biyokimya Toplam Test Süreci Rehberi. May 2024, Publication No. 1287. https://dosyamerkez.saglik.gov.tr/Eklenti/48692/0/tibbi-biyokimya-toplam-test-sureci-rehberipdf.pdf (accessed October 2, 2026)
• Republic of Türkiye Ministry of Health, General Directorate of Health Services. Karar Sınırı (Eşik Değer), Kritik Değer (Panik Değer) ve Ölçüm Birimlerinin Harmonizasyonu Prosedürü. 22.09.2020. https://dosyamerkez.saglik.gov.tr/Eklenti/15143/0/karar-siniri-esik-deger-kriek42009846pdf.pdf (accessed October 2, 2026)
• Republic of Türkiye Ministry of Health. e-Nabız Kullanım Kılavuzu V2.1. 31.05.2025. https://enabiz.gov.tr/document/User_Manual.pdf (accessed October 2, 2026)