July marks 15 years since I started my journey taking a biologic injection to manage and treat my Crohn’s disease. Since that time, I’ve had routine “safety labs” every 3-6 months, depending on my gastroenterologist. You may be familiar with safety labs, or you may wonder what I’m talking about. I’ve been seeing my current GI for almost 8 years, and she’s adamant that I get labs every 3 months to make sure my disease is closely monitored. If I fail to get labs every 3 months, per her orders, my prescription for Humira is unable to be filled by my specialty pharmacy.

I ran a poll on Instagram and asked, “If you are on a biologic, do you get safety labs every 3 months?” Of the 175 people who responded, 41% said “yes”, 36% said “no”, and 23% had no idea what safety labs are. This week on Lights, Camera, Crohn’s we take a closer look at the reasoning and purpose behind safety labs, and we hear from esteemed and world-renowned gastroenterologists Dr. David Rubin, MD, Section Chief of Gastroenterology, Hepatology, and Nutrition at the University of Chicago Medicine and Dr. Miguel Regueiro, MD, Chair, Digestive Disease and Surgery Institute, Professor in the Department of Medicine, Cleveland Clinic.

What is a safety lab?

Safety labs are to ensure that patients are not developing a complication from a medication that they may not feel. 

“For example, kidney or liver function tests that may show an abnormality before a patient has damage to those organs, or problems. Or a white blood count that lowers in a patient on certain immunosuppressive therapy – something they may not “feel” until the immune system gets low enough to develop an infection,” explained Dr. Regueiro. 

The periodicity of labs for “safety” are often taken from the clinical trial designs, rather than the likelihood that something is going to change within that period of time.

“Routine labs while on therapies for IBD is important and patients can and should keep track and ask for them at least twice a year for most of our therapies. For many of these, there are gaps in our understanding whether the interval (every 3 months for example) is the right one or makes a difference. We certainly know it takes time for patients to do this and costs money too. Some of my colleagues withhold refills as a safeguard to make sure patients get their labs. This may be more punitive than necessary, but it is one way to make sure this is getting done,” said Dr. Rubin.

When I get my labs done every 3 months the following blood tests are ordered by my GI:

• CBC w/Auto Differential
• Hepatic Function Panel (Liver Panel)
• Vitamin D 25 Hydroxy (I am deficient, so we keep a close eye on this)

If there is concern about inflammation or anemia, then my GI also adds:

• Sedimentation Rate, automated
• High Sensitivity CRP
• Iron Profile with IBC + Ferritin
• In the past, if there’s concern about my response to Humira we do a “trough level” to see if I’ve built up antibodies to my therapy and to measure how much medication remains in my body right before I am scheduled to do another injection.

It’s important to know, since I started seeing my GI two months after my bowel resection surgery in 2015, I have been in remission. So, the concern about inflammation and needing to take fecal calprotectin tests has been few and far between. When we were in the middle of the pandemic, rather than an annual colonoscopy, my doctor had me do a fecal calprotectin test at home to limit my risk of being exposed to germs in a hospital setting while my disease was well-managed.

“We recommend certain labs on patients taking IBD medications. Each medication will require a different safety lab monitoring strategy. Some brief examples, for mesalamine, checking kidney function tests within a couple of months of starting a medication and then once or twice a year. For thiopurines (6MP and Imuran) and methotrexate more frequent blood work initially, e.g., complete blood count and liver function tests weekly to every other week in the first two months after starting and then every few months thereafter,” said Dr. Regueiro.

Safety labs as a disease monitoring strategy

Generally, safety labs are done for medical health reasons to make sure that everything is ok while taking the medication. 

“Safety labs are “driven” by the physician or provider caring for the patient. The insurance company may require certain labs before starting or continuing a medication. For example, a tuberculosis (blood) test before starting an anti-TNF medication and then yearly while a patient is on the medication. Otherwise, the insurance company usually does not require safety labs for medication approval or continuation. Each case is different, and each insurance company is different,” said Dr. Regueiro.

“More important than pharma-drive lab recommendations—is that every patient should have a customized strategy to monitor their disease stability to detect relapses before there are clinical consequences. This is my new take home message for most of my lectures- in addition to “treating to a target” we must have “disease monitoring” as something that every patient has as part of their care,” said Dr. Rubin.

Chronic diseases like IBD tend to “drift away from control”, so it is good to keep an eye on things and this enables proactive preventive care.

“For low-risk patients, that might be once a year, but for those who are on advanced therapies (biologics and the novel targeted small molecules), they likely need this approach more frequently. It is true that “knowledge is power,” and knowing that the disease has activated enables much better care,” explained Dr Rubin.  

Disease monitoring may involve blood or stool markers (calprotectin) or depending on where you live, intestinal ultrasound. Colonoscopy or CT scan/MRI is also recommended. Dr. Rubin tells me the key is identifying what is appropriately benchmarked and reliable and which approach is feasible and makes the most sense for the patient.

Why the onus is often on us

As you can imagine, 3 months comes quickly. If you’re like me, I see my GI in clinic two times a year (every 6 months). When I was pregnant, she would see me in the office every 3 months. Given that I see her twice a year, that checks off two of my four lab visits. As an IBD mom juggling life with three young kids, time can often slip away. I’ve found I must alert my nurse and GI about when and where they need to submit lab orders so I can take care of them the other two times a year at a Quest or LabCorp nearby. In the past there have been a few times where I’ve dropped the ball.

Coordinating life with chronic illness can truly feel like a full-time job. Just this week I spent an hour on the phone with my specialty pharmacy trying to organize my next shipment because there was an issue with my patient savings card. At the time, all three of my kids were running around like little banshees, yelling, and making it hard for me to hear the phone representatives. At one point, I had to lock myself in my laundry room. These aren’t calls that can wait. Patients need their medication; we can’t just hang up and re-visit the snafu at another time because it can mean we receive our biologic shipment late. This is one small example—of a behind-the-scenes look at life with IBD as a mom.

While getting labs four times a year may not seem like a lot, it does involve planning, time, and coordination for patients. My kids have joined me countless times in the stroller as I get labs done. Then, reading the results on the Patient Portal and seeing certain results too low or too high can cause anxiety and added stress. It’s a never-ending cycle.

Talking with your care team

If you’re only getting labs done once or twice a year, it may be worth having a conversation with your GI about the reasoning why and what you feel most comfortable with. Your care is not a one-way street. If you feel like you need a more hands-on approach, talk about this with your doctor. In talking with fellow IBD patients, many who are on infusions every 8 weeks, tell me they get labs every 16 weeks.

If you’re only getting labs done once a year, Dr. Regueiro says you don’t necessarily need to be alarmed.

“For a patient who has been on a medication like mesalamine or a TNF inhibitor for a long time, in remission, and doing well without prior lab test abnormality, once per year lab testing may be ok. However, a patient on Imuran or 6MP may need lab testing more frequently.”

As a veteran patient, who was diagnosed with Crohn’s nearly 18 years ago, safety labs have become part of how I manage my IBD. While annoying at times, these labs also give me a sense of relief. One final recommendation I have—don’t try and get labs done before or after your colonoscopy—I’ve tried this twice to try and kill two birds with one stone, and with being so dehydrated, it was not a pleasant experience. Being closely monitored through safety labs takes away much of the stress and worry that can come because of being on a biologic, and the possible side effects that can happen now and into the future.

A special thank you to Dr. David Rubin and Dr. Miguel Regueiro who took the time to offer their expertise for this article on the heels of Digestive Disease Week (a HUGE conference they both actively participate and present at). Having their insight on topics like this that matter to patients means so much.