Seeing urine ketones on a dipstick during pregnancy can be scary — especially when you have gestational diabetes mellitus (GDM) and your brain jumps straight to diabetic ketoacidosis (DKA).
But most of the time, ketones in pregnancy are about fuel + timing + hydration, not an emergency.
This guide explains ketones in gestational diabetes, what different ketone levels can mean, the difference between urinary ketones and blood ketones, what counts as a healthy level vs high ketones, and how to prevent ketones safely (without accidentally going too low carbohydrate).
Julija notes: Ketones are one of those topics where a quick test result can create a LOT of fear. You're not failing — you're just getting data.
Ketone bodies are chemicals your body produces when it burns fat for energy instead of glucose. That can happen when:
you're not eating enough (especially carbs)
you skip meals
you're possibly dehydrated
you've exercised more than usual
you've fasted overnight (hello, morning urine)
In pregnancy, this can happen faster than you expect because of something called accelerated starvation (pregnancy metabolism shifts so you can make ketones sooner when you haven't eaten).
Your body prefers glucose for energy. In gestational diabetes (an abnormal glucose metabolism state caused by pregnancy hormones), insulin doesn't work as efficiently, and your body may also be more sensitive to fasting.
When glucose isn't available (or you're not eating enough), your body burns fat and produces ketones.
Ketones can show up even when your blood glucose levels look fine because ketones are often more about not enough fuel (or dehydration) than about high glucose.
Urine ketone testing is the most common approach in pregnancy. A dipstick shows trace amounts, small, moderate, or large.
Urine results can be influenced by:
dehydration (concentrates urine)
morning urine (more concentrated after overnight fasting)
time lag (urine reflects what happened earlier)
Capillary blood ketones are measured from a fingerstick (similar to glucose testing). These blood samples are more real-time and often more accurate than urine.
If your urine ketones are repeatedly moderate/large, or you have symptoms, ask your provider whether blood ketone testing is appropriate.
Julija notes: A single urine strip can be noisy. Patterns matter more than one-off results.
If you're eating very small amounts (or can't keep food down), your body may switch to fat-burning.
What to do: Try a gentle carb + protein combo (like crackers + cheese, Greek yogurt + berries)
Long gaps can trigger ketones — especially in pregnancy.
What to do: Aim for regular meals + snacks (more below).
Some mamas lower carbs to get lower blood sugar levels. But if you go too low carb (or unintentionally follow a keto diet), ketones can rise.
What to do: Don't aim for "no carb." Follow your clinic's carb plan and use your post-meal numbers to adjust portions.
Being dehydrated is one of the most common reasons for elevated ketone body readings in urine.
What to do: Drink water consistently. If you're vomiting, ask your provider about electrolyte drinks that fit your plan.
More exercise can increase ketone production if you don't eat enough carbs to match.
What to do: Add a small snack around activity.
Clinics vary, so always follow your provider's guidance. In general:
Trace ketones (especially in morning urine) can be usual in pregnancy.
Persistent moderate or large/high levels deserve evaluation.
If you're unsure what a "healthy level" means in your clinic, ask for their exact thresholds and what they want you to do at each level.
This is where the anxiety comes from, because ketones are sometimes talked about in relation to fetal central nervous system development and infant outcomes.
The balanced take is that there is a perceived risk with sustained high ketones, but the evidence is mixed. Some studies have looked at associations between higher ketone exposure and outcomes like lower IQ, but the data are limited and often confounded by illness, nutrition, and overall diabetes control. (Source)
Most real-world cases in gestational diabetes involve trace ketones or short-lived elevations that improve with hydration and eating. So the practical takeaway is: preventing high ketones is a good goal, but panicking over trace ketones is not helpful.
Julija notes: If your provider is concerned, it's usually because they want you to eat enough and avoid prolonged fasting — not because one trace strip means harm.
Diabetic ketoacidosis is rare in gestational diabetes, but it's serious.
Seek urgent care if you have high ketones (moderate/large) PLUS any of the following:
very high blood glucose levels (often >200 mg/dL)
vomiting / can't keep fluids down
rapid breathing / shortness of breath
severe weakness, confusion
abdominal pain
other symptoms like fruity breath
This needs immediate medical evaluation and treatment.
One of the simplest prevention strategies is consistent eating:
3 meals (carb + protein + fat + fiber)
2-3 snacks between meals
This reduces long fasting windows and helps stabilize both glucose and ketones.
A bedtime snack can reduce overnight fasting and help with morning ketones.
For ideas and how to pick "the best" bedtime snack, read our Bedtime Snacks for Gestational Diabetes post.
If you're only drinking later in the day, your morning urine can look more concentrated.
Try:
water on waking
water with each meal/snack
a glass before bed (if it doesn't worsen reflux)
Illness increases risk of dehydration and ketones.
If you can't eat full meals, aim for:
frequent small amounts of carbs
sips of fluids
call your provider early if you're not improving
If your clinic recommends ketone testing:
Use mid-stream urine when possible
Consider re-testing later in the day (not only first morning urine)
Log food, fluids, and activity so you can see what triggers elevations
If urine ketones stay elevated, ask whether capillary blood ketones should be checked
Different clinics follow different guidance (for example, NICE guideline approaches can differ from US practices). Some providers reference the American Diabetes Association for diabetes standards in pregnancy.
If you're getting mixed messages, ask:
What ketone level is concerning in your clinic?
Do you want urine or blood ketone testing?
What should I do at trace vs small vs moderate?
Ketones in gestational diabetes are usually a sign you need more fuel, more fluids, or less fasting — not a sign you've done something wrong.
Focus on:
regular eating
hydration
calling your provider if ketones are high or you have symptoms
You're doing the work to keep you and your baby safe. 💜
1. Should I test ketones with gestational diabetes?
Not always. Some providers recommend ketone testing for pregnant women who are vomiting, losing weight, eating very low carb, or have other risk factors. Ask what's usual in your clinic.
2. What causes urine ketones in pregnancy even with normal glucose levels?
The most common causes are dehydration, overnight fasting, skipping meals, and eating too few carbs or calories — even if your blood sugar looks okay.
3. How do I get rid of ketones fast (safely) while pregnant?
Drink fluids and eat a carb + protein snack/meal. Ketones often improve within hours once your body has glucose available again.
4. Are trace amounts of ketones normal in pregnancy?
Trace ketones can be common, especially in morning urine. Persistent moderate/large ketones should be discussed with your provider.
5. When should I call my doctor about ketones?
Call if you have moderate/large ketones, you're dehydrated, you're vomiting, you have symptoms of DKA, or you're unsure what to do.
6. Urine ketones vs blood ketones: which is more accurate?
Blood ketones are generally more accurate and real-time. Urine ketones are easier to test at home but can be affected by hydration and timing.
Medical disclaimer: HIgedi is a support and education resource, not medical care. Always follow your healthcare provider's advice for ketone testing, ketone levels, and treatment.
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