Long-Term Steroids: 5 Numbers to Track

Long-term steroid use is managed with 5 numbers, not with how the cat looks on a good day: weight, water intake, blood glucose, blood pressure, and a blood panel covering liver enzymes and electrolytes. Check them at fixed points — baseline, day 14, week 6, month 3, then every 3 months — and the drug stays a tool instead of becoming the next diagnosis. The cat cannot report a side effect; the numbers can.

Why 5 fixed items and not a general checkup

Steroids raise blood glucose, push water intake up, move potassium down, raise blood pressure in some cats, and mask infection by blunting fever and raising the white count. Each has a cheap, repeatable measurement, and each drifts before the cat looks sick. Owners notice at the point of no return: 6 weeks of 300 ml a day is already a diabetes workup. A schedule catches the drift at 2 weeks.

Item 1: weight, on the same scale, every week

Weigh once a week at home, same scale, same time, before the morning meal, and write the number down. Steroids commonly drive appetite up, so a gain of 5 percent in 8 weeks is expected and manageable; a loss of 5 percent in 6 months or 10 percent in 3 months is the opposite signal — muscle wasting, poor absorption, or an illness the drug is hiding. A 4.8 kg cat that reaches 5.3 kg has gained 10 percent, and that is the point to review diet and dose with the vet rather than cut food alone.

Item 2: water and urine, measured over 48 hours

Normal intake for a cat is 40 to 60 ml per kg per day; above 100 ml per kg is polydipsia and needs a reason. Measure it properly once a quarter: fill a measured jug, leave only that water out for 48 hours, and subtract what is left, then divide by 2 days and by body weight. A 4.5 kg cat drinking 450 ml a day is at 100 ml per kg and past the line. Watch the litter box too: 2 or more large clumps a day, a clump that falls apart, or a cat that avoids the box means volume and glucose both need checking.

Item 3: blood glucose and urine sugar, read together

A single high glucose in a cat is often stress, not diabetes: clinic values of 250 to 300 mg/dL (14 to 17 mmol/L) happen in a frightened cat with a normal pancreas. That is why the pair matters. A fasting glucose above 250 mg/dL (14 mmol/L) with glucose in the urine on 2 separate samples, plus a fructosamine above 400 micromol/L, is a different conversation from one high reading. Home curves or a sensor give 24 hours of data instead of 1 point, and urine dipsticks are cheap enough to run twice a week.

Item 4: blood pressure, the quiet one

Systolic pressure is measured with a Doppler or oscillometric cuff on the tail or foreleg, and the reading is only useful after 3 to 5 consistent measurements in a quiet room. Under 150 mmHg is normal, 150 to 160 is borderline, above 160 mmHg on 2 visits means treat or investigate, and above 180 mmHg is an emergency for the eyes and kidneys. Steroids plus age plus kidney disease is the common stack, and none of it shows until a retina detaches. Ask for pressure at every second recheck.

Item 5: the panel — liver, potassium, infection

Run a full panel with a urinalysis at baseline and every 3 to 6 months: ALT and ALP for the liver, potassium and sodium for the electrolyte shift, glucose and fructosamine, plus a CBC, since steroids raise neutrophils and eosinophils and hide infection. A potassium of 3.0 mmol/L against a normal 3.5 to 5.5 is a reason to call, not to wait. Keep every result in one folder with dates; 4 panels in a row say more than any single page.

The 5-item monitoring table

Item	Unit	Low	High	Days	Act when
Weight	% of baseline	95	105	7	5 percent shift in 8 weeks
Water intake	ml/kg/day	40	60	90	Above 100 ml/kg/day
Glucose, fasted	mg/dL	80	150	90	2 positive urine tests
Systolic pressure	mmHg	90	160	180	Above 160 twice, 180 once
Potassium	mmol/L	3.5	5.5	90	ALT doubled, K under 3.0

The table is deliberately boring: 5 rows, 3 fixed intervals of 7, 90 and 180 days, 3 home measurements, and nothing on it needs a specialist on the day you collect it.

The recheck calendar

Baseline before the first dose: weight, water log, glucose, fructosamine, urinalysis, pressure, full panel. Day 14: weight and water, to see how fast the appetite and thirst response arrives. Week 6: glucose and urine sugar, since steroid-induced diabetes declares itself in the first 4 to 8 weeks. Month 3: full panel, pressure, weight trend. Then every 3 months for the first year, and every 6 months if all 5 items are stable. At 12 months do a full set with pressure, because a year is long enough for a silent change to become a real one.

Signals that should not wait for the next recheck

Call within 24 hours for: over 100 ml per kg per day for 3 days, 2 positive urine glucose tests, 5 percent weight loss in 8 weeks, vomiting 3 or more times in 24 hours, black stool, a new lump, an eye gone cloudy or red, or fever above 39.5 C. Call the same day for a cat that cannot stand, breathes with an open mouth, or seizes. A cat on steroids can go from stable to critical in 48 hours, and the drug is often still right — it needs the dose reviewed, not repeated.

Tapering is not stopping

A cat on steroids for more than 2 to 3 weeks has a suppressed adrenal response and cannot simply stop. Tapering runs in steps measured in weeks, with a recheck at each step, because a fast taper — lethargy, poor appetite, vomiting — looks exactly like the disease returning. Never split or double a dose for a missed day; call and ask. If the plan is long-term, ask at the start what the exit looks like and which of the 5 items shows it first.

Start the log tonight

Weigh the cat once and write date, weight and scale name on the first line of a new page.
Measure 48 hours of water this weekend; a jug marked in millilitres is the whole kit.
Book the day 14 and week 6 visits before leaving the clinic, not after.
Ask for the panel results as raw numbers with ranges, and file them in 1 folder.
Put the 3-month review on the calendar with the 5 items listed in the note field.

If the steroid is part of a breed-specific plan, the review dates are already set in the York Chocolate care calendar. Add the monitoring visits to the yearly estimate with the cat cost calculator.

Frequently asked

How often should a cat on long-term steroids be checked?

Baseline before the first dose, then day 14, week 6, month 3, and every 3 months for the first year. After 12 months, cats with stable weight, water intake, glucose, pressure and bloodwork can move to every 6 months. Water and weight are the two items worth measuring at home between visits, because they drift first.

What water intake is too much on steroids?

Normal is 40 to 60 ml per kg per day, and above 100 ml per kg is polydipsia. A 4.5 kg cat passing 450 ml a day has crossed that line. Measure over 48 hours with a marked jug rather than guessing, and pair it with a urine glucose strip, since increased drinking and glucose in the urine usually appear together.

Can I stop the steroid once the cat seems normal?

No. After 2 to 3 weeks of steroids the adrenal response is suppressed, so stopping abruptly can cause a crisis. Tapering happens in steps measured in weeks with a recheck at each step, because the signs of a fast taper look identical to the original disease returning. Ask at the start what the exit plan is and which number triggers it.