Blood in Guinea Pig Urine: Bladder Stones, UTI & Uterine Disease Explained
Blood in a guinea pig's urine is always a veterinary finding that needs evaluation — unlike rabbits, guinea pigs do not produce harmless red pigmented urine, so visible blood is almost always clinically significant. The most common causes are bladder stones, urinary tract infections, and in females, uterine disease. Early diagnosis can be the difference between a treatable urinary stone and a life-threatening obstruction.
Last reviewed: June 2026
What Blood in Guinea Pig Urine Looks Like
Normal guinea pig urine ranges from pale yellow to bright orange or red-brown — similar to rabbits — because guinea pigs also excrete plant pigments. However, the presence of true blood (hematuria) can be distinguished by:
- Pinkish to bright red discoloration that is distinct from the normal dark orange-amber
- Urine accompanied by straining, vocalizing, or repeated attempts to urinate
- Visible clots, blood spots on the cage floor separate from urine
- Bloody discharge from the genitals not directly associated with urination (suggests uterine disease in females)
- Urine dipstick positive for blood (test the fresh urine with a human dipstick)
Completely normal orange or dark yellow guinea pig urine tests negative for blood on dipstick. If positive, hematuria should be confirmed with microscopy (urine sediment).
Common Causes of Blood in Guinea Pig Urine
As described in Quesenberry and Carpenter's Ferrets, Rabbits, and Rodents and per AEMV 2024 guidelines:
Urolithiasis (bladder or kidney stones): Guinea pigs are highly predisposed to calcium oxalate and calcium carbonate urinary stones due to their calcium metabolism. Stones cause hematuria, frequent urination, straining, and pain. On radiographs, calcium-containing stones in guinea pigs are typically very radiopaque (visible on X-ray). Bladder stones causing urinary obstruction are a life-threatening emergency requiring urgent surgical removal.
Urinary tract infection (UTI) or cystitis: Bacterial infection of the bladder wall causes hematuria with straining, frequent small amounts of urine, and sometimes pus-like discharge. Female guinea pigs are more vulnerable due to their short, wide urethra. Culture and sensitivity testing guides antibiotic choice.
Uterine disease: In intact (unspayed) female guinea pigs, uterine bleeding presents as blood in the urine — or more accurately, blood from the vulva that mixes with urine. Causes include endometrial hyperplasia, uterine cysts, and uterine cancer. Blood visible primarily at the end of urination or not correlated with urination frequency suggests uterine disease.
Renal disease or tumors: Kidney tumors or infarcts can cause hematuria. Usually associated with other signs of renal disease (weight loss, elevated creatinine on bloodwork).
Diagnostic Workup
A guinea pig with suspected hematuria should have:
- Urinalysis and urine sediment microscopy — confirms RBCs, bacteria, crystals
- Urine culture and sensitivity — required before antibiotic prescription
- Abdominal radiographs ($150–$350) — highly sensitive for calcium-containing stones; mandatory for any guinea pig with hematuria
- Abdominal ultrasound ($200–$400) — assesses bladder wall, kidneys, and uterus in females
- Bloodwork (CBC + chemistry, $100–$250) — for renal function and systemic health
Treatment Options
For bladder stones:
- Small stones in female guinea pigs may pass spontaneously with increased water intake and dietary modification
- Larger stones or stones in males (who have a much narrower urethra) require surgical cystotomy ($600–$1,500 at an exotic specialist)
- Dietary prevention after stone removal: reduce calcium-rich foods (no alfalfa, limit spinach, kale, and parsley), ensure abundant fresh water, and consider a low-calcium pellet
For UTI:
- Oral trimethoprim-sulfonamide, fluoroquinolone, or other antibiotic per culture sensitivity — typically 2–3 weeks
- Repeat urinalysis after completing antibiotics to confirm resolution
For uterine disease:
- Ovariohysterectomy (spay) is curative for most uterine causes; AEMV 2024 recommends spaying female guinea pigs if not intended for breeding to prevent both uterine disease and the stress of repeated reproductive cycling
When to See an Exotic Vet
Call your exotic vet today if:
- You see any pink, red, or blood-tinged urine from your guinea pig
- Your guinea pig strains to urinate, vocalizes, or makes frequent unproductive litter attempts
- You see bloody discharge from the vulva
- Your guinea pig has not eaten or is unusually lethargic
Go to the exotic ER immediately if:
- Your guinea pig cannot urinate at all — complete urinary obstruction is a life-threatening emergency
- Your guinea pig is collapsed, cold, or unresponsive
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Frequently Asked Questions
Is orange guinea pig urine normal? Yes — normal guinea pig urine can be dark yellow, orange, or brown-orange from plant pigments. True blood gives a distinctly pinkish to red color, especially with straining or visible spots on the cage floor. A urine dipstick can help differentiate.
Can a guinea pig pass a bladder stone on its own? Very small stones in female guinea pigs may pass spontaneously if the diet is corrected and water intake increases. However, stones large enough to cause obvious hematuria usually require surgical removal. Male guinea pigs have a much narrower urethra and are at higher risk for life-threatening obstruction from small stones.
How do I prevent bladder stones in guinea pigs? Feed a low-calcium diet: avoid alfalfa hay (switch to Timothy), limit high-oxalate vegetables (spinach, parsley, kale), provide abundant fresh water (a water bottle plus a bowl), and offer a pellet formulated for adult guinea pigs rather than one intended for growth and breeding.
How much does guinea pig bladder stone surgery cost? Surgical cystotomy (bladder stone removal) at an exotic specialist typically costs $600–$1,500 including pre-operative bloodwork, anesthesia, surgery, and hospitalization. The cost varies by geography and specialist. Pre-operative radiographs add $150–$350 if not already done.
Should I spay my female guinea pig? AEMV 2024 guidelines recommend spaying female guinea pigs if they are not intended for breeding. Unspayed females are at risk for uterine cysts, endometrial hyperplasia, and uterine tumors. Spaying early (under 6–12 months) dramatically reduces these risks. Spay costs at exotic specialists range from $200–$600.
Still Not Sure if Your Guinea Pig Needs a Vet?
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