What does “occult blood 1+” mean?
May 19, 2022
Source: Cainiu Health
Dr. Zhao Xinju
Introduction
A trace of blood (microscopic hematuria) may be caused by conditions such as urinary calculi (kidney stones) or nephritis. In patients with urinary tract stones, the stones are often hard and can cause mechanical irritation or injury to the renal pelvis and ureter during physical activity, leading to localized bleeding in the urinary tract mucosa and resulting in a positive occult blood test in urine. Clinically, patients may also present with renal colic, low back discomfort or pain, and fever. However, if microscopic hematuria is present without other accompanying symptoms, IgA nephropathy should be considered.
In hospitals, routine urinalysis is commonly performed. “Occult blood” is a standard item on the urinalysis report. So, what does “occult blood 1+” mean?
What does occult blood 1+ indicate?
Occult blood 1+ may be caused by conditions such as urinary tract stones or nephritis. In patients with urinary calculi, hard stones can irritate the renal pelvis and ureter during physical activity, leading to localized mucosal bleeding in the urinary tract and resulting in a positive occult blood test in urine. Clinically, this may also present as renal colic, low back soreness or pain, and fever. However, if occult blood is positive without other accompanying symptoms, IgA nephropathy—a type of glomerulonephritis—should be considered. In this condition, increased glomerular permeability allows red blood cells to leak into the urine. If no proteinuria is detected, regular follow-up urinalysis and close observation are recommended.
When occult blood is reported as 1+, the most critical step is identifying the underlying cause of bleeding. Gastrointestinal (GI) bleeding is one major possibility. Common causes include anal ulcers, hemorrhoids, and anal fissures. With anal fissures, bleeding is typically spurting and appears bright red, often coating the surface of stool after defecation. Another potential source is bleeding from colorectal polyps or malignancies. Polyp-related bleeding is usually minimal and may be accompanied by other intestinal symptoms, such as changes in stool consistency or frequency. In cases of tumor-associated bleeding, further diagnostic evaluation and treatment are essential. Therefore, proctoscopy and colonoscopy are crucial for determining the precise etiology of bleeding.
Emphasis should be placed on daily health maintenance. If urinalysis reveals abnormal occult blood levels—either elevated or decreased—prompt intervention and appropriate treatment are warranted. We hope this information proves helpful to you!
