Purpose. Diagnostic services are bought on trust: the buyer can rarely judge a laboratory service directly and relies on cues such as clarity, consistency and credibility. How a small marketing team turns those cues into content, and how direct prospecting complements that content, is seldom documented from the inside. This study examines how website, LinkedIn, Instagram, poster and brochure communication and cold calling worked together in the digital marketing and business development activity of LABRIDGE, a unit of Healtholife Healthcare Pvt Ltd, an Indian diagnostic services company.

Design/methodology. A single-site, participant-observation case study was conducted over about ten weeks (25 May to 31 July 2026), during which the author worked as a digital marketing and business development intern. Data comprise assignment records, the creatives produced (including a five-slide B2B LinkedIn carousel and three awareness-day posts), reflective field notes and secondary conceptual literature. No platform analytics, call logs or conversion data were available for publication, so no performance outcomes are reported. Observations were organised by channel and by stage of the sales process and interpreted through the hierarchy-of-effects (AIDA), perceived-risk and credence-attribute, B2B content-marketing and relationship-selling literatures.

Findings. Five patterns emerged: (i) each channel played a distinct communication role, from information (website) to professional credibility (LinkedIn) to visual awareness (Instagram); (ii) healthcare content required plain language, a single message per creative and claims that could be traced to approved company information; (iii) the B2B carousel followed a problem–solution–proof–action order that maps closely onto AIDA, while the awareness-day posts were calendar-anchored and educational; (iv) cold-call quality depended more on a structured opening, relevant need-questions, listening and accurate records than on the length of the pitch; and (v) marketing and business development formed a two-way feedback loop, in which content supplied credibility for calls and calls supplied questions for content. These are reported as observed processes, not measured effects.

Originality and implications. The paper offers an inside account of integrated digital and direct outreach in an Indian diagnostic services company, converts the observations into five testable propositions and five low-cost managerial practices. Because the design is single-case, qualitative and participant-based, findings are analytically rather than statistically generalisable.

Keywords: diagnostic services; healthcare marketing; digital marketing; content marketing; cold calling; B2B business development; AIDA; participant observation; India