Best Keto Blood Meter

The ketogenic diet is one of the few diets out there where you know where you stand. You’re either in ketosis or you’re not. The most convenient way to check this is to have a keto blood meter, more commonly called ketone meters, in the home.

Below we’ve gathered the best ketone meters that operate off of drawing and analyzing blood, writing out a small entry for each so you can see their upsides and downsides at a glance.

We’ve also included a small buyers’ guide that goes into the different types of ketone meters and their properties, so you can learn about the testing kits available to you.

In a hurry?

If you need to monitor your ketones sometime soon, allow us to make your search easier by presenting you with our top option here.

This way you can be done with it and go about the rest of your day.

We chose the Keto-Doc Advanced Ketone Blood Meter Kit, see why in some more detail below:

  • Easy to use and works via a non-invasive process thanks to using thinner lancets and requiring only small blood samples.
  • Fast and accurate ketone results in ten seconds or less, ideal for instant readings when testing portably.
  • No control solution is required to ensure the product functions properly, meaning you get more use out of strips.

Buyers’ Guide

How to find the best ketone blood meters

Keto blood meters and their accompanying kits are pretty standard, so you should be focusing on the individual components of those kits since there is some variety there that can make the kit as a whole more interesting to you.

Kits usually consist of the meter, the strips, the lancing device, and their lancets.


The meter is the star of the show in blood meter kits, as their name suggests. There are three main factors we’d say you have to look at, these being the quantity of blood required to get a good test, the amount of time in which they complete that test, and the calibration of the sensor.

The quantity of blood is measured in microliters, and the least you’ll find on the market (for now) is a 0.5µL minimum requirement, with others ranging from 0.8 to 1.0µL. If you’re the kind of person that doesn’t bleed well or gets faint at the sight of blood, then activating your sensor with the smallest droplet of blood possible will be something to look for.

The time at which they complete that test is pretty self-explanatory, and it comes down to personal preference and patience. The fastest we’ve found, which features in the above list, is eight seconds. The average is ten seconds. That makes this feature more of a mark of high quality for the product as a whole rather than an important buying factor in and of itself, after all, what’s two less seconds in a ten second wait?

Calibration is probably the most important here, since many sensors will need you to fiddle around with them in order to set them up. This can get frustrating, and so that’s why we recommend ones that require no calibration. You’ll see this on their product pages when they boast that no coding is required to use them, they’re usable right out of the box.


When looking at strips you should consider how many come in the initial kit purchase, but you should also look at that brand’s compatible testing strips.

You’ll need to refill these, and so looking at the price of repeating purchases like these will give you a better idea of the true cost of the kit. We think this is important as price can vary wildly.

In our research we found refill strip boxes that, when broken down individually, retailed at approximately 0.60 cents a strip to a whole $3 a strip.

Also, if you are using a blood glucose kit that permits ketone testing, you’ll want to make sure you have strips that are compatible with that function.

Lancing Device

The lancing device is the second piece of tech that comes in any kit, they’re designed to puncture your finger in as painless a way as possible.

There are a few ways they try this, from adding stimulating nodules to the tip to try and lessen pain sensations by replacing them with stronger massaging sensations, to having adjustable lancing depths to cater to a wide variety of people with different finger widths or pain and blood tolerances.

Lancet compatibility should also be considered since some lancets will only work with certain brands whereas others can take a wide variety of standardized lancet inserts.

You’ll want a lancing device that can preferably take lancets from different sources as this allows you to shop around for the cheapest lancets, since brand-exclusive lancets can get expensive.


You should consider the price of restocking lancets too, since many kits will only come with ten single-use lancets that’ll need to be replaced eventually. In the long run you should grab lancets that are inexpensive to replace so that your kit can be as cost-efficient to maintain going forward.

Some of these lancets are designed to reduce pain and discomfort, too, often by having smaller and thinner needles or triple beveled edges in order to make the point of penetration as smooth as possible.

Some also use vibration-dampening plastics that absorb needle movements as it gets pushed into the skin, stopping it from disturbing the wound any more than it needs to upon entry.

Frequently Asked Questions

What should blood ketone levels be for weight loss?

Your ketone levels are measured in mmol/l, and there are different ranges that have different implications on your physical fitness. Anything below 0.5mmol/l is below the threshold for ketosis, so fat isn’t being burned, whilst above that you’ll start moving into ketosis. Above 1.5mmol/l is your window for optimal ketosis, and so maximum weight loss. Over 3.0mmol/l isn’t necessary and isn’t wise to be crossed, especially if you are diabetic.

What are the best times to test blood ketones?

The best time to get the most accurate ketones readings is the morning before you’ve eaten or drank, though noon and evening before eating are close runners-up. Setting and keeping a routine based around this also helps you get into the swing of things but, if you must pay close attention to your blood levels, you can test whenever it’s convenient for you.

Can you test ketones with a glucose meter?

Only certain blood glucose meters are capable of reading and reporting on the ketone content in your blood, such as our number four option. You shouldn’t assume that all blood glucose meters are capable of reporting on your ketones, because that’s a recipe for disappointment.

Even when blood glucose meters are capable of reading blood ketone content, unless explicitly stated that they come with ketone strips on their product page, you’ll probably have to buy the brand-compatible ketone strips as a separate purchase.

This can end up costing a lot, so we’d only really recommend this if you do have health conditions that require blood glucose meters, like diabetes, since then it can be a convenient all-in-one piece of equipment.

Which form of ketone testing is the most accurate?

When it comes to the accuracy of ketone testing, it’s hard to compare directly due to the differences in how they work, but blood meter testing is definitely the higher tech means of doing so. The three kinds of testing methods, blood meters, breath meters, and urine meters.

They measure different ketones in the body, with blood meters measuring the β-hydroxybutyrate circulating through your body. It requires a small amount of blood for testing and is quick and easy.

Breath testers measure acetone, and testing comes in the form of Ketonix or LEVL, which can require a lot of setup between charging, calibration, and downloading accompanying apps to your smartphone. However, once set up it takes a deep exhale to get a measurement.

The urine test strips measure acetoacetate in a relatively low-tech method of measuring ketones in your bodily fluids. You just need to read the strip after dipping it into urine after a given period of time, which is subject to change, so you should always read the instructions to tell how long you must wait before reading your ketone levels.

Of them all we’d say that blood and urine are the most ‘accurate’ simply because of their relative simplicity. The breath testing isn’t complicated, but the software involved can have its own hang-ups and there’s room for human error in exhaling (which is not the same as deep breaths, which many try to do).

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